Pump



June 13, 1961 FAY 7 2,988,010

PUMP

Filed Sept. 30, 1959 2,988,010 PUMP This invention relates to a pump for pumping or compresslng fluids and more particularly, constitutes an improvement on the invention disclosed in my copending application Serial No. 607,157, filed August 30, 1956, now Patent No. 2,919,652.

It is an object of the present invention to provide a pump of relatively simple structure, embodying but a few parts which are easy to form and readily assembled.

It is also an object of the invention to provide a pump wherein the means for valving the inlet and outlet passages from the piston-receiving cylinder comprise relative- 1y rigid members having sleeves frictionally mounted on the pistonrod for sliding movement therewith and therealong into and out of valving position.

Another object of the invention is to provide a pump wherein the valve members, while being frictionally mounted by the piston rod for sliding movement therewith into and out of valving position, are relatively rigid, thus resisting distortion and wear and being adapted to withstand extreme pressure.

It is further an object of the invention to provide a pump wherein the piston-receiving cylinder, piston rodreceiving bore, valving chambers and fluid passage means are formed in a housing by cooperating members slid- ,nited States Patent ably, sealingly disposed therein, the members being adapted to be fabricated on conventional machinery and readily assembled with the housing. i 7

It is still further an object of the invention to provide a pump of relatively simple construction, having valving members slidably and frictionally carried by the piston rod into and out of valving position for controllingthe flow of fluid into and out of the piston-receiving cylinder, which is readily manufactured and assembled at a minimum of expense and is ofsuch rugged character it will function for a long period of time with freedom from all difiicu-lties.

Other objects and advantages will beapparent from the specification and claims when considered in'connection with the attached sheet of drawings illustrating one form of the invention wherein like characters represent like parts and in which: I

FIGURE 1 is a longitudinal sectional view of a pump embodying the concepts of the invention and showing the piston on the intake stroke and the position of the valving members relative thereto; Y

FIG. 2 is similar to FIG.'1 but shows the piston and valving members during the compression stroke; and a FIG. 3 is a cross-sectional view of the pump taken in the direction of the arrows 3-3 in FIG. 2. p

Referring now to the drawings fora more detailed description of the invention, a pump 10 isshown having a housing 11 provided with a piston-receiving cylinder 12 at one'end to receive a'piston 13 and a bore 14-extending therethrough to slidably receiveapiston'rod 15 .con-

nected to the piston, said piston and piston rod being reciprocated by. any suitable :Il'l8aI1S, (;l10t shown).;,;fIhe

piston 13 is provided with a suitable seal, herein illus- .trated as an O-ring 16,.mounted in agroove 17 in; the

periphery of thepistonand adaptedto engage the walls of the cylinder. The housing is provided with a passage 18 (see FIG. 1) .whichcommunicates an inlet passage19 of an'inlet fitting19a to the cylinder, and with a passage 20 e 2,) w m ica s h l nder-with an outlet passage 2 t e r o t e m n -2.1a. ..Elh passages, according to the invention, are controlled by valve means .22 and 23, including respectively, valve chambers 24 'and'25 and movable valve members 26 and 27.

While the pump housing 11 may be cast or similarly formed as an integral unit, in the preferred form of the invention, as illustrated, it comprises a cylindrical housing member 28 formed with a bore 29 having cooperating means 30 therein to provide the piston-receiving cylinder ,12, bore-14, fluid passages 18 and 20 and chambers 24 and 25. The means, which are slidably, sealingly disposed within the bore 29 and are retained therein by a plug 31 threaded to the end of housing 11, comprise a plurality of stacked complementary members. As shown, a first annular member 32 abuts a shoulder 33 formed by a reduced portion 34 of bore 29 and defines therewith the piston-receiving cylinder 12. Annular member 32 is provided with an enlarged axial bore 35 and has a reduced bore portion 36 defining the fluid passage 20, the bore 35 opening into bore 36 through a flared portion 36a. A second annular member 37 abuts member 32 and defines with the enlarged bore 35 the valve chamber 25. Annular member 37, which has an axial bore 38 forming part of piston rod-receiving bore 14 and in which the rod is journaled, is provided with a passage 39 extending parallel the bore 38 and aligned with a similarly formed passage 40 in the member 32 for forming part of the fluid passage 18. An O-ring seal 41 is disposed in an annular groove opening on bore 38 for preventing the flow of fluid around piston rod 15; Positioned adjacent member 37 is an annular member 42 having an inwardly directed flange 43 engaging the member 37 and spacing it therefrom. The annular member 42 is provided with a bore 44, forming part of passage 18, having an inwardly directed flared opening 45 for a purpose to be hereinafter explained. An annular member 46 having a bore 47 forming part of the piston-receiving bore 14 and having an enlarged bore portion 48 defining the valve chamber 24 is disposed between annular member 42 and the threaded retaining plug 31. An O-ring seal 49 disposed in a groove 50 in bore 47 seals the piston rod-receivin bore against fluid leakage. The members 46 and 32 are each formed with a radially extending bore 51 adapted to be aligned with a threaded bore 52 formed radially in cylindrical housing member 28. .The bores 51 are adapted to receive the tubular members 53 of fittings 19a and 211; having integral, outwardly extending annular shoulders 54 intermediate the ends thereof and form the inlet and outlet passages 19 and 21. The tubular members are positioned in the members 46 and 32 to communicate the chambers 24 and 25 with the inlet and outlet fittings, respectively. An O-ring seal '55 is disposed between the shoulders 54 of each of the tubular members and its respective annular member for sealing the same and the tubular members are locked in position by means of collars 56 threaded into the bores 52.

The movable. valve members 26 and 27 are substantially identical members having sleeves 57 slidably and frictionally carried by piston rod 15 and enlarged head portions 58 bevelled as at 59. I I

The sleeve portions 57 of the valve members are of such a' length as to permit only limitedmovement of the members within their respective valve chambers, thus vcausing thevalves' to be quick to respond andcontrolling the ;erablyfiormed. of some substantially rigid material, such ,asmetah; plastic or thelike' or combination thereofj'are as shown, so positioned on the piston rod as to close the and closed position respectively.

passages 18 and 20, by the engagement of the bevels 59 with the flared passage portions 45 and 36a, on'the compression stroke or the in-stroke of the piston 13 respectively.

In the operation of pump according to' the invention, as the piston 13 and piston rod 15 move to the right in the direction of the arrow, the movable valve members .26 and 27 are frictionally carried by the piston rod to the right to open fluid passage 18 and close fluid passage 20. In this manner fluid is permitted to enter the pump through inlet passage 19 and thereafter travels through fluid passage '18 to the cylinder 12. It at this point should be noted that interference in the continued movement of the piston and piston rod to full in-stroke position is eliminated by the moveable valve members 26 and 27 left to valve-01f fluid passage 18 from the inlet passage 19 and open communication through fluid passage 20 from cylinder 12 to the outlet passage 21.

According to the invention, during the in-stroke of the pump, a vacuum is created in piston-receiving cylinder 12 which maintains the valve members 26 and 27 inopen The piston during the compression stroke, similarly, exerts a pressure on the valve members to. maintain them in the position to which they were moved by the piston rod during the compression stroke. Thus itwill be seen, that a positive force acts on the valve members to maintain them in open'or "closed position during the in-stroke and compression stroke of the pump. 7

By means ofthe invention a pump has been provided for pumping or compressing fluids which is simple in structure, positive in operation and of such rugged character it will function without interruption for long periods of time.

It will be seen that the simple design of the pump lends itself to various types of construction; it can be made from metal or plastic materials or any combination thereof,'and the individual elements of'the pump are readily adapted to be fabricated by conventional machine tools.

In assembling the pump illustrated herein, theseparateannular members and'the movable-valve members are positioned in order on the piston rod 15 which is thereafter inserted within the'cylindricalhousing member 28 so that the piston 13 is disposed within'piston-receiving cylinder 12.. In order to maintain the proper alignment of thefluid passages during the assembling of the-pump, as the elements thereof are stacked on piston-rod 15, an aligning pin or the like may be'tempo rarilypositioned to extend through bores 39 and 40 of members 37 and 32. After the piston and housing members have been disposed in cylindrical housing member 28, plug 31 is threaded into the end of the housing member to lock the members 32, '37, 42 and 46 in position against shoulder 33.

Thus, among others, the several objects and advantages :of the invention as aforenoted are achieved. Obviously numerous changes in the structure may be resorted to fined by the claims.

7 I claim:

1. A pump comprising a housing having a piston-re- I ceiving cylinder and a piston rod-receiving boretherein;

having fluid .passagemeans therein connecting with said cylinderand inlet and outlet-passages-connecting-;with

without departing from the spirit of the invention as de- 7 4 said fluid passage means; and a valve means including a valve member having a sleeve slidably and frictionally mounted on said piston rod for movement therewith and therealong, said valve member cooperating with said passage means for controlling the flow of fluid to and from said cylinder through said inlet and outlet passages respectively, in response to reciprocation of said rod in said housing. r

2. A pump comprising a housing having a piston-receiving cylinder and a piston rod-receiving bore therein; a piston r eciprocatingly mounted in said cylinder and having a piston rod slidable in said bore, said housing having fluid passage means therein connecting with said cylinder and inlet and outlet passages connecting with said fluid passage means; and a valve means including a rigid valve member having a sleeve slidably and frictionally mounted on said piston rod for movement therewith and therealong, said rigid valve member cooperating with said passage means for controlling the flow of fluid to and from said cylinder through said inlet and outlet passages respectively, inresponse to reciprocation of said rodin said housing. 7

3. A pump comprising a housing having separate means therein forming a piston-receiving cylinder and a piston rod-receiving bore; a piston reciprocatingly mounted in said cylinder and having a piston rod slidable in said bore, saidhousing having fluid passage means therein connecting with said cylinder and inlet and outlet passages connecting with said fluid passage means; and a valve means including an annular metal valve member having a sleeve slidably, frictionally mounted on said piston rod formovement therewith and therealong, said annular valve member cooperating with said passage means for controlling the flow of fluid to and from said cylinder through said inlet and outlet passages respectively, in response to reciprocation of said rod in said housing.

4. A pump comprising a housing having a pistonreceiving cylinder and a piston rod-receiving bore therein; a piston reciprocatingly mounted in the cylinder and having a piston rod slidable in said bore, said housing having means providing spaced chambers opening. on said 'bore; fluid passage means connecting each of said chambers with saidcylinder, said housing having inlet and outlet passages connecting with said chambers; and a valve member disposed in each of said chambers and cooperating with said passage means'for controlling the flow of fluid .to and from said cylinder through said inlet and outlet passages in response to reciprocation of said rod in said housing, said valve members each having a sleeve slidably, frictionally mounted on said rod for movement therewith and therealong.

5'. A pump comprising a housing having a pistonreceiving cylinder and a pistonrod-receivingbore therein; a piston reciprocatingly mounted in the'cylinder 'and having a piston rod slidablerin said bore, saidhousing having means providing spaced chambers opening on said bore; fluid passageime ans connecting each of said chambers with saidcylinder, said housing havingfinlet'and outlet passages connecting with said chambers; and a substantially rigid sleeve-like valve member disposed in each of said chambers and cooperating with said passage means for'controlling the flow of fluid to and from said cylinder through said inlet and outletv passages in response to reciprocation of said rod in .said housirig, said valve members being slidably, frictionally mounted on said rod for movement therewith and therealong.

'6. A' pump comprising a housing having removable meansforming a piston-receiving cylinder and a piston rod-receiving bore therein and pr oviding spaced chambers opening on said bore; a piston'reciprocatingly mounted in thecylinder and having a piston rod slidable in said bore; fluid passage means connecting each of said chamfbe'rs with said cylinder, said'housing having 'inlet and outlet passages connecting with said chambers; and valve members having sleeves slidably, frictionally mounted on said piston rod, said valve members being disposed in said chambers and cooperating with said fluid passage means for controlling the flow of fluid to and from said cylinder through said inlet and outlet passages in response to reciprocation of said rod in said housing.

7. A pump comprising a housing having means therein forming a piston-receiving cylinder and a piston rodreceiving bore and providing spaced chambers opening on said bore, said means including a plurality of complementary members slidably, sealingly disposed within said housing having aligned passages forming fluid passage means connecting each of said chambers with said cylinder; a piston reciprocatingly mounted in the cylinder and having a piston rod slidable in said bore; said housing having inlet and outlet passages connecting with said chambers; and valve members having sleeves slidably, frictionally mounted on said piston rod, said valve members being disposed in said chambers and cooperating with said fluid passage means for controlling the flow of fluid to and from said cylinder through said inlet and outlet passages in response to reciprocation of said rod in said housing.

8. A pump comprising a cylindrical open ended housing having means cooperating therewith forming a pistonreceiving cylinder and a piston rod-receiving bore and providing spaced chambers opening on said bore, said means including a plurality of annular complementary members slidably, sealingly disposed within said housing having aligned passages forming fluid passage means connecting each of said chambers with said cylinder and means for locking said members in aligned position in said housing; a piston reciprocatingly mounted in the cylinder and having a piston rod slidable in said bore; said housing having inlet and outlet passages connecting with said chambers; and valve members having sleeves slidably, frictionally mounted on said piston rod for movement therewith and therealong, said valve members being disposed in said chambers and cooperating with said fluid passage means for controlling the flow of fluid to and from said cylinder through said inlet and outlet passages in response to reciprocation of said rod in said housing.

9. A pump comprising a housing having a pistonreceiving cylinder and a piston rod-receiving bore therein; a piston reciprocatingly mounted in said cylinder and having a piston rod slidable in said bore, said housing having means providing spaced chambers opening on said here; fluid passage means connecting each of said chambers with said cylinder, said housing having inlet and outlet passages connecting with said chambers; and a valve member disposed in each of said chambers and cooperating wtih said fluid passage means for controlling the flow of fluid to and from said cylinder through said inlet and outlet passages in response to reciprocation of said rod in said housing, said valve members each having a sleeve slidably and frictionally mounted on said rod for limited movement therewith and then slidable along said rod, whereby the flow of fluid through said fluid passages is limited.

10. A pump comprising a housing having a pistonreceiving cylinder and a piston rod-receiving bore therein; a piston reciprocatingly mounted in said cylinder and having a piston rod slidable in said bore, said housing having means providing spaced chambers opening on said bore; fluid passage means connecting each of said chambers with said cylinder, said housing having inlet and outlet passages connecting with said chambers; and a valve member disposed in each of said chambers and having a sleeve slidably and frictionally mounted on said rod, said valve member cooperating with said fluid passage means for controlling the flow of fluid to and from said cylinder through said inlet and outlet passages in response to reciprocation of said rod in said housing, said valve members being positively maintained in cooperative relation with said fluid passage means in either direction of reciprocation of said piston by the fluid pressures in the cylinder during movement of the piston.

References Cited in the file of this patent UNITED STATES PATENTS 2,313,284 Valentine Mar. 9, 1943 2,919,652 Fay Ian. 5, 1960 

